淬火后的逆相变退火温度对5%Mn冷轧中锰钢组织与性能的影响

doi:10.13251/j.issn.0254-6051.2022.07.016

金属热处理 ›› 2022, Vol. 47 ›› Issue (7): 92-97.DOI: 10.13251/j.issn.0254-6051.2022.07.016

淬火后的逆相变退火温度对5%Mn冷轧中锰钢组织与性能的影响

樊立峰^1,2, 亢泽¹, 贾丽英³, 徐惠敏¹, 高军⁴

1.内蒙古工业大学材料科学与工程学院, 内蒙古呼和浩特 010051;
2.内蒙古工业大学稀土金属材料工程研究中心, 内蒙古呼和浩特 010051;
3.河钢集团邯钢公司技术中心, 河北邯郸 056015;
4.内蒙古包钢钢联股份有限公司薄板坯连铸连轧厂, 内蒙古包头 014010

收稿日期:2022-02-18 修回日期:2022-05-24 出版日期:2022-07-25 发布日期:2022-08-12
作者简介:樊立峰(1980—),男,副教授,博士,主要研究方向为电工钢新技术、汽车钢轻量化技术等,E-mail:fanlifeng829@163.com
基金资助:
内蒙古自然科学基金(2020MS05006);内蒙古科技攻关计划(2020GG0265);内蒙古自治区级大学生创新创业训练计划(202010128014);内蒙古自治区研究生科研创新项目(S20191140Z)

Effect of reverse phase transformation annealing temperature after quenching on microstructure and properties of 5%Mn cold rolled medium manganese steel

Fan Lifeng^1,2, Kang Ze¹, Jia Liying³, Xu Huimin¹, Gao Jun⁴

1. School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot Inner Mongolia 010051, China;
2. Engineering Research Center of Rare Earth Metals, Inner Mongolia University of Technology, Hohhot Inner Mongolia 010051, China;
3. Technology Center, HBIS GroupHansteel Company, Handan Hebei 056015, China;
4. CSP Plant of Inner Mongolia Baotou Steel Union Co., Ltd., Baotou Inner Mongolia 014010, China

Received:2022-02-18 Revised:2022-05-24 Online:2022-07-25 Published:2022-08-12

摘要/Abstract

摘要： 对5%Mn冷轧中锰钢进行930 ℃×20 min淬火后再进行660、665、675、685 ℃保温30 min的逆相变退火处理,并用光学显微镜、扫描电镜、X射线衍射仪等研究退火温度对中锰钢组织和力学性能的影响。结果表明:5%Mn冷轧中锰钢经过高温淬火和逆相变退火后的组织为超细晶铁素体、板条马氏体和奥氏体。随着逆相变退火温度由660 ℃增加至685 ℃,奥氏体含量先增加后降低并在665 ℃逆相变退火后达到最大值,抗拉强度持续增加,屈服强度先升高后降低并在675 ℃退火时达到最大,伸长率先升高后降低并在665 ℃时达到最大值。综合来看,5%Mn中锰钢冷轧板经过930 ℃×20 min淬火和665 ℃×30 min逆相变退火后的综合力学性能最佳,此时奥氏体体积分数为24.24%,抗拉强度为980 MPa,伸长率为23.68%,强塑积达到了23.21GPa·%。

关键词: 冷轧中锰钢, 退火温度, 微观组织, 力学性能

Abstract: Effect of annealing temperature on microstructure and mechanical properties of a 5%Mn cold rolled medium manganese steel after quenching at 930 ℃ for 20 min and then reverse phase transformation annealing respectively at 660, 665, 675 and 685 ℃ for 30 min were studied by means of OM, SEM and XRD. The results show that after high temperature quenching and reverse phase transformation annealing, the microstructure of the 5%Mn cold rolled medium manganese steel is composed of ultra-fine-grained ferrite, lath martensite and austenite. As the reverse phase transformation annealing temperature increases from 660 ℃ to 685 ℃, the austenite content increases first then decreases and reaches the maximum value at 665 ℃, the tensile strength increases continuously, the yield strength increases first then decreases and reaches the maximum value at 675 ℃, and the elongation increases first then decreases and reaches the maximum value at 665 ℃. In conclusion, the comprehensive mechanical properties are the best for the 5%Mn cold rolled medium manganese steel after quenching at 930 ℃ for 20 min and then reverse phase transformation annealing at 665 ℃ for 30 min, at which the volume fraction of austenite is 24.24%, the tensile strength is 980 MPa, the elongation is 23.68%, and the product of strength and plasticity is 23.21 GPa·%.

Key words: cold-rolled medium manganese steel, annealing temperature, microstructure, mechanical properties

中图分类号:

TG142.1

樊立峰, 亢泽, 贾丽英, 徐惠敏, 高军. 淬火后的逆相变退火温度对5%Mn冷轧中锰钢组织与性能的影响[J]. 金属热处理, 2022, 47(7): 92-97.

Fan Lifeng, Kang Ze, Jia Liying, Xu Huimin, Gao Jun. Effect of reverse phase transformation annealing temperature after quenching on microstructure and properties of 5%Mn cold rolled medium manganese steel[J]. Heat Treatment of Metals, 2022, 47(7): 92-97.

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淬火后的逆相变退火温度对5%Mn冷轧中锰钢组织与性能的影响

Effect of reverse phase transformation annealing temperature after quenching on microstructure and properties of 5%Mn cold rolled medium manganese steel

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